1. calorie requirements
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Calorie • Calorie is the energy content in food • The energy content in food can be calculated by burning a known mass of food in oxygen in a bomb calorimeter . • 1 calorie is the amount of heat energy needed to raise the temperature of 1g of water by 1 Celsius. • 1 calorie = 4.2 joules • Different classes of food have different caloric value carbohydrate 17.2 kJ/g Protein 22.2 kJ/g Fat 38.5 kJ/g
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Transcript of 1. calorie requirements
Calorie• Calorie is the energy content in food
• The energy content in food can be calculated by burning a known mass of food in oxygen in a bomb calorimeter.
• 1 calorie is the amount of heat energy needed to raise the temperature of 1g of water by 1 Celsius.
• 1 calorie = 4.2 joules
• Different classes of food have different caloric value
carbohydrate 17.2 kJ/g
Protein 22.2 kJ/g
Fat 38.5 kJ/g
CALORIC VALUES OF FAST FOOD
FACTORS THAT AFFECTS THE CALORIC REQUIREMENT OF HUMAN
Factors Requirement Explaination
Sex Male requires more calories than female
Male more active, have bigger body size
Body size Bigger sized individual needs more calories than a smaller sized person
Bigger size means more cells
Age Growing children needs more calorie than adults
Children have higher metabolic rate and higher growth rate
State of health
Invalid requires less calorie
Coronary heart patient needs less calorie intake
Need special diet
To avoid weight gain
Physical activities
Individuals that are involved in physical activities or occupation need more calorie
Use more energy when doing physical activity.
Surrounding temperature
Individuals living in a cold place require more calorie than those living in a hot place
More energy is needed to replace heat lost to the environment and to maintain body temperature
END OF SUBTOPIC 2.1.1
